[videoblogging] Re: Multiple cams

[Roger]

--- In videoblogging@yahoogroups.com, Steve Watkins [EMAIL PROTECTED] wrote:

Yeah in theory theres nothing to stop multiple cams being used at the
same time. A powerful machine starts to become necessary depending on
the res, framerate, codec and efficiency of the camera drivers used.

 I've been simultaneously capturing two 720x480, 60i, DV camcorders
via firewire on a PC for 3D with no problems, but I have a quite
*fast* PC. I also have to use _two_ separate firewire cards. I've
never tried three at once.
 I have had minimal luck trying this with USB cams, and believe me, I
have tried :-) Usually, my computer just crashes :-)
 I use GraphEdit to do this... downloadable from a variety of websites.
 Keep in mind, this does not genlock or clock-sync cameras. To genlock
cameras, you have to genlock the cameras, themselves, or figure out a
way to clock-sync them or at least monitor the sync via a separate
video output or LANC connection, and that will eventually drift. I use
a tool called a Sync Shepherd: www.ledametrix.com/lcdsync/ to monitor
the sync, but on that same website there is a tool called a LANC
Shepherd, if you have LANC, that actually can give you a good degree
of sync at power-up (but again, that would drift in time).
 Simultaneous firewire capture to a computer does not insure frame
sync, even with clock-synced cams, although I get perfect frame sync
most of the time. I have to check it every time. Syncing to better
than 1/500th of a second can be important for 3D, but depending on
your intentions, it may not be necessary.
 You can find firewire webcams, but you would not be able to
clock-sync them or monitor the sync, because you need a separate video
output or LANC to do that.

Roger

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[videoblogging] Re: Multiple cams

[Roger]

--- In videoblogging@yahoogroups.com, Roger [EMAIL PROTECTED] wrote:

  You can find firewire webcams, but you would not be able to
 clock-sync them or monitor the sync, because you need a separate video
 output or LANC to do that.

 Actually, those would not be clock-controlled, anyway... I've never
tried to use two firewire webcams. It might be fun to try, but I've
never seen the point in using them since I have DV camcorders to work
with.
 You'll still need separate firewire cards with a PC for simultaneous
capture.
 Of course, if you are not doing 3D, accurate syncing is probably not
a huge issue, anyway, for DV captures.

Roger





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[videoblogging] Re: Multiple cams

[Dan R]

in the windows only world, there's a software niche called worship 
software. the requirements are similar to vjing. while i use a dual 
moniter set up split to multiple projecters and a separate multi-camera 
station feeding me a single input. the top programs ( about $400)
support multiple video sources and three virtual moniters. you still 
have to pick one feed at a time although you can switch on the fly. if 
you choose to use a single monitor you'll need a cheat sheet or 
memorize your control screen( for me the added mental load cuts down on 
creativity).





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